Drum for hoisting mechanisms and the like.



J. R. MQGIFFERT,

DRUM FOR HOISTING MECHANISMS AND THE LIKE.

' APPLICATION FILED DBO. 28.1906. 91 6,581

Patented Mar. 30, 1909.

$14 Y r. a 5' 3 UNITED sTA'r s PATENT oFEIoE.

JOHN R. nelrrnnp, oF' DULUTH, MINNESOTA,-- as'srGNon- 'ro CLYDE IRON womm, F

- nuturnnmnnsorx, A ooaroaarrouor MINNESOTA.

DRUM FOR HUIST I NG MECHANISMS AND THE LIE.

specification of Letters Patent. Patented March 80, 1809,

Application and December 23, 1906. serial, No. 349,838.

- To all whom it may concem'."

Be it known that 1, JOHN R. MoGmFEn'r,

.; ,a citizenof the United'States, resident of Duluth,- county of St. Louis, and State of Minnesota, have invented a new and useful Improvement in Drums for Hoisting Mech.

anism and the Like, of. which the following is a s eeification, the principle of the invention eing herein explained and the best mode in which I. have contem lated apply-Y ing that principle, so as to istinguisi it from other'lnventions. a

My lnventlon relates, as 1nd1cated,tto 1mprov ements in hoisting mechanism, and has regard more particularly to the Provision of an improved friction drum, such as is used in connectio with mechanism of th1s' charac ter, to op rate loadmg or'skiddlng lines and "Such invention consists of meanshereinafter. full described and particulany set forth int e claims.

, The annexed drawing and the following closed means constitutingfihowever," but one of 'various mechamcal forms in wlnch the description set forth in detail certain mechanism embodying the invention, such disprinciple of the invention may be used.

Insaid annexed drawing? Figure 1 rep'resents a central longitudinal cross-sectionof a friction drum and parts appertaining thereto,

in which have been embodied'the several improvements contemplated by my invention; while Fig. 2 shows a similar cross-sectional view, on a larger scale, of a detail of the mechanism of such drum.

. Referring to Fig. 1, it will be noted that A A designate, respectively, the stand bearings of the engine, in which is rotatably sup-.-

ported a shaft B. On the latter, intermediately of the bearings .A A, is rotatably mounted the hoisting drum C; and adjacent to one end of such drum, but fixedly mounted on the shaft is a large spur gear B which,

- by means of suitable intermediate conne'c tion with the hoisting engine, is designed to drive shaft B continuously. ,The ad acent faces of drum 0 and spur gear B are adapted to frictionally engage each other by being respectively provided with a lateral flange c an friction blocks 1) that are adapted to registe with said flanqal, and frictionally "tional-f" engagement ormally such fricetween flange c and blocks 5 ispre' ented by means of a resilient carry; same alon supp member, preferably ahelical spring I) that surrounds shaft B intermediately of spur ear B and. end of drum C, and retains the letter some distance removed from the former-Q In order to effect such frictional engagement, and thereby rotation-of the drum, the following mechanism is. rovided:

Near the otherv end of the shaft B, t iatisfthe end opposite spur gear B, there is {provided in. such shaft a transverse slot within which is slidably' mounted across-key b the latter being held against dislodgment fromthe slot by means of pins 1; secured inits respective endsl Such cross-key rests against substantially triangular steel blocks b b, op v positely disposed in slot 11 the outer ends of such blocks bearing against an adjustable set collar B mount'ed on shaft B adjacent to the slot. The vertices of these blocks; res ectively, rest a ainst cross-key b. Upon t e outer end of ongitudinally reciprocable thrust-pin B is fixedly mounted a bronze disk 19' which is inclosed aboutby a hollow thrust-nut b spanning the pin end and .secured against rotationby being attached to the adjacent stand bearing A' or equivalent ort.

'90" In such thrust-nut b is mounted the usual thrust-screw 6 which its-adapted to be rotated by means of a cr'ank B.

The operation ofrnyimproved friction drum shouldbe obvious from theforegoing description, of its construction; However,

by way of conclusion, sucho eration may be briefly stated as follows: i ormally owing to theaction of s ring b drum C does not rotate with shaftB, since the facesof-flanoe c and friction blocks 1) on driving gear B 0 not then on age. Vl hen, however, it becomes desira lej to have such drum rotate, it is shifted laterally on the shaft B against theppressure of sprin b to effect such frictional engagement. lhis shifting is accomplished, as will be readily apparent from an inspection of Fig. 1,.by a rotation of crank B whereby the thrust-screw b is caused to bear against the disk I) mounted on the outer end of.-thrust-pin B Thelatter is thereby forced inwardly against, the inner ends of the triangular blocks Z2, which blocks,

being in effect fulcrumed in the set collar B exert a lever action on the cross-key b against which they press, and. thus upon drum C, through the interposed loose collar 0. W hen the pressure of the screw on the end of thrust-pin B is released by a counterrotation of crank B", the effect of spring I) is to forthwithrestore'all the parts to their normal positions, and rotation the drum thereupon ceases.

In the construction and operation of the drum as' above described, I should call attention in the first place to the feature of the engines of. ordinary size, frequently close on to 10,000 lbs.. Not only is this benefit obtained,. but the very rapid 'wearrof these parts due to such tremendous pressure, when as in the usual construction the pressure is received directly on the end of the it is desired to have the drum rotate.

thrustin, is to a large extent reduced This is no not so much to the material, steel, of which the blocks are formed, as above stated, but because theydo not themselves move on the parts on which they bear after once they are placed in operating position. Furthermore, such slight wear as does take place may be readily'taken up by a proper adjustment of set collar B thus enabling y u the thrustmg mechamsmto be always mamtained in plroper'adjustment relatively to the drum.- '1 e thrust-screw box or nut is intended to contain lubricant, and while I do. not claim the employment of'such a boxin itself as presenting novel features, yet I would call attention, as forming a second feature of my improved drum, to the disk rig'idly mounted on the end of the thrust-pin and housed within this box or nut. It will be remembered that the inner end of the thrust-screw is forced. against this disk wThlpn 1s disk being made of hard bronze forms an excellent and enduring bearing surface, and furthermore,and more important, since the lower portion of it constantly turns in the oil or other lubricant in the hollow box or thrust-nut,there Will be an opportunity every time that the thrust-screw is turned off, which, of course, is uite fre uent, for the oil o run down over t e face 0' the disk and thus lubricate the center of the'disk with which the end of the screw comes-in contact.

v lateral movement of the This result is obviously not attained where such end of the thrust screw bears directly I tail, that whichl particularly point out and distinctly claim, is: r

' 1. The combination with shaft, said shaft and drum being relatively axially shiftable to secure the latter to the former; of means'for effecting such :relative shifting, such means comprising a thrust pin longitudinally reciprocable in said shaft, and a lever member interposed between the end of said pinand said drum,- said member having its one end fulcrumed on said shaft and. the other engaging said pin,and being con I .a driving shaft and a drum normally rotatable upon said nected with said drum intermediately. of

such ends. r

2/ The combination with a driving shaft and adrum normally rotatableupon said shaft, said shaft and drum. being relatively axially shiftable to secure the latter to the former; of means for effecting such relative shifting, such means comprising a thrust pin centrally mounted in said shaft and-longitudinallyreciprocable thereof, a'collar ad- 'justably mounted upon said shaft, and a plurality of. radially disposed lever-mom ers having their outer ends fulcr'umed in said collar and their inner ends engaging said pin',

and connected with said drum mtermedi ately of such ends. Y

3. The combination' with a driving shaft}- and a drum normally rotatable upon said shaft but axially shiftable into operative engagement therewith, of means for thus shifting said drum, 'such means comprising a ios thrust-pin longitudinally reciprocable in said shaft, a collar adjustably mounted upon said shaft, and a lever-memberinterposed between the end of said pin and said drum, said member being fulcrumed in said collar.

4. The combination with a driving shaft and a drum normally rotatable upon said gagement therewith, of means for thus shifting said drum, such means comprising a thrust-pm longitudinally reclprocable 111 said shaft, a collar adjustably mounted upon said shaft butaxially shiftable into operative en-' shaft, and a lever-member interposed between the end of said pin and said drum,

said member having its one end fulcrumed in said collar and the other'engaging said pin, and bearins against said drumintermediately ofsuch ends.-l t

5. The combination with a driv} g shaft and a drum normally rotatable upon said shaft but axially shiftable into operative engagement therewith, of means for thus-shifting said drum, such means comprising a thrust-pin longitudinally}reciprocable' 1n sa d mean shaft, and a levermember interposed between the end of said pin and said drum, said member having its one end fulcrumed on said shaft and the other engaging said pin, and being connected with said drum intermediately of such ends.

6, The combination with a driving shaft and a drum normally rotatable upon said shaft but axially shiftable into operative engagement therewith, of means for thus shift ing said drum, such means yomprising a thrust-pin centrally mounfid in said shaft and longitudinally reciprocable thereof, and a plurality of radially disposed lever-members having their outer ends fulcrumed on said shaft and their inner ends engaging said pin, and connected with said drum lntermediately of such ends.

7. The combination with a driving shaft anda drum normally rotatable upon said shaft but axially shiftable into operative engagement therewith, means for thus shifting said drum, such means comprising a thrust-pin'centrally mounted i:; said shaft andlongitudinally reciprocable thereof, a key transversely mounted in'said shaft oppo site the end of said thrust pin and bearing against the end of said drum, a longitudinal slot being provided in said shaft for the recoption of said key, and two lever members oppositely disposed in such slot, said members having their outer ends fulcrumed on said shaft and their inner ends engaging said pin, and bearing against said key intermediately of such ends.

8. The combination with a driving shaft and a drum normally rotatable upon said shaft but axially shiftable into operative en gagement therewith, of means for thus shifting said drum, such means comprising a thrust-pin centrally mounted in said shaft and longitudinally reciprocable thereof, a member interposed between the end of said drum and said pin and adapted to have a I lever action on said drum, and another member adjustably mounted on said shaft and engaging the outer end of said first member so as to provide a fulcrum therefor.

9. The combination with a driving shaft and a drum normally rotatable on said shaft but axially shiftable into operative engagement therewith, of means for thus shifting said drum, such means comprising a thrustpin mounted in said shaft and longitudinally reciprocable thereof, and oppositely-disposed angular members loosely interposed between the end of said pin and of said drum, said members being 'fulcrumed on said shaft and having a lever action upon said drum.

10. The combination with a driving shaft and a drum normally rotatable upon said shaft but axially shiftable into operative engagement therewith, of meansfor thus shift-- said drum, such means comprising a thrust- 131 centrally mounted in said shaft and longitudinally reci rocable thereof, and two oppositely-dispose substantially triangulu' ocks inter osed between the. end of em a lever action on the latter.

11. The combination with a driving shaft and a drum normally rotatable upon said shaft but, axially shiftable into operative engagement therewith, of means for thus shift mg said drum, such means comprising a centrally mounted in said shaft thrust-pm and longitudinally reciprocable thereof, a

key transversely mounted in said shaft opposite the end of said thrust-pin and bearm against the end of said drum, a longitudina slot bein provided in said shaft for the reception of said key, terposed between said thrust pin and said key and adapted to have a lever action on the latter.

12. The combination with a driving shaft and a drum normally rotatable upon said shaft but axially shiftable into operative en gagement therewith, of means for thus shifting said drum, such means comprising a. thrust-pin centrally mounted in said shaft and longitudinally reciprocable thereof, a key transversely mounted in said shaft opposite the end of said thrust-pin and bearin against the end of said drum, a longitudina slot being provided in said shaft for the re: ce tion ofsaid key,.two oppositely-disposed, su stantially triangular blocks inte osed between said thrust-pin and said ey and adapted to have a lever action on the latter and a SS4 coilar'adjustably mounted on said shaft and forming a fulcrum'for said blocks.

'13, In mechanism of theclass described,

combination of a shaft, a spur gear fixedly mounted thereon for driving the same, a drum rotatably mounted on said shaft but axially shiftable into frictional engagement with said driving gear, a spring interposed: between said drum and gear and normally preventing such enga ement, and means for pin and said rum, and adapted to have and triangular blocks in- 1 shifting said drum thus into engagement,

such means comprising a thrust-pin centrally mounted in said shaft and longitudinally reciprocable thereof, a key transversely mounte in said shaft op osite the on of said thrust-pin, a longitu inal slot beingprovided in said shaft for the reception of, said key, a loose collar interposed between said key and said drum, two oppositely-disposed, substantially triangular blocks interposed between said thrust-pin and said key and adapted to have a lever action on the latter. and a set collar adjustably mounted on said shaft and forming a fulcrum for said blocks.

Signed by me, this 24th day of December, 

